Pump Jack Is a device used in the petroleum industry to extract crude oil from a oil well where there is not high enough pressure in the well to force the oil to the surface. These pump jacks physically extract the oil for use.Pump jacks and oil derricks are commonly confused, but are not the same. Pump jacks operate by creating something known as artificial lift. This process of creating artificial lift simply increases the pressure within an oil well to pull oil to the surface. It is common fo